Question 206 · LDEK · Impressions and impression materials
Indicate the correct order of steps when taking the one-step impression in 2-layer technique for castable post and core:
1) introducing the second layer of impression material with the Lentulo spiral into the canal;
2) preparation of an impression tray, application of tray adhesive;
3) application of the first layer of impression material on the tray and inserting it into patient’s oral cavity;
4) preparation of a piece of stick, adjusted to the root canal, roughening it, application of the adhesive;
5) cutting all the undercuts in the impression and around the prepared tooth;
6) introducing prepared cone into the canal.
The correct answer is:
2) preparation of an impression tray, application of tray adhesive;
3) application of the first layer of impression material on the tray and inserting it into patient’s oral cavity;
4) preparation of a piece of stick, adjusted to the root canal, roughening it, application of the adhesive;
5) cutting all the undercuts in the impression and around the prepared tooth;
6) introducing prepared cone into the canal.
The correct answer is:
- A. 2,4,3,5,6,1.
- B. 2,4,3,5,1,6.
- C. 4,2,3,5,1,6.
- D. 2,4,1,5,6,3.
- E. 2,4,1,6,3.
Hint
In a one-step technique both layers must set together, so the loaded tray goes in last; trimming undercuts belongs only to a two-step method.
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